Updated rxscala GAV coordinates in README

This patch updates rxscala GAV coordinates in README file examples, to reflect recent project GAV changes.
Merge pull request #22 from sslavic/patch-1

Updated rxscala GAV coordinates in README
Remove before_install

See https://github.com/ReactiveX/RxScala/issues/20#issuecomment-57520111
Update publishViaTravis.sh